A new series of Schiff bases derived from pyrazole-thiocarbohydrazide, namely (4a-d), were well-synthesized. The synthesis is carried out using monothiocarbohydrazone derivative (3), which was prepared via coupling of 5-chloro-pyrazole-4-carbaldehyde (1) with thiocarbohydrazide (2) in absolute ethanol that contains a catalytic quantity of acetic acid. The structures of newly synthesized compounds were fully clarified by various spectroscopic analyses (FT-IR, ¹H-NMR, ¹³C-NMR, and mass spectra) and elemental analysis. Also, the molecular docking was performed to investigate the binding interactions of the synthesized compounds (1, 3 and 4a-d) with COX-2 active site. The results revealed that most of them have robust hydrogen bonding networks and favorable binding energies compared to compound (4b). Understanding the anti-inflammatory behavior through understanding the specific interactions of these compounds with COX-2 will aid in the design and development of more effective inhibitors for therapeutic applications.

The present paper proposed the tri-potassium phosphate catalyzed synthesis of some novel series of Schiff bases (3a to 3l) derived from 2-aminopyridine using microwave technique. All synthesized Schiff bases were confirmed by different spectroscopic methods. Further all synthesized imines have been evaluated to screen for antimicrobial, antioxidant and anti-inflammatory activity. The compound 3c displays potent anti-inflammatory activity with 42.307%±1.322 inhibition of inflammation. The antioxidant activity data revealed that all synthesized Schiff bases exhibit potency to scavenge DPPH and nitric oxide radicals. Antimicrobial properties of these compounds showed moderate to excellent growth of inhibitory activity against various tested pathogens. Our observations and examination for pharmacological study towards the presence of active pharmacological functional groups present in the main structural nucleus of synthesized imines. Therefore, present study may lead to the development of a new class of anti-inflammatory and antioxidant drugs with structural modification.

A series of (E)-1-methyl-3-((substituted phenylimino)methyl)quinolin-2(¹H)-one schiff bases (3a-j) bearing quinoline moiety synthesized successfully in ethanol by condensation of starting material 1-methyl-2-oxo-1,2-dihydroquinoline-3-carbaldehyde (1) with various substituted anilines (2a-j). The structure of the newly synthesized compounds was confirmed by proton (¹H) and carbon (¹³C) nuclear magnetic resonance spectroscopy, Fourier transformation infrared (FT-IR), Mass spectroscopic study and elemental analysis. The in-vitro antimicrobial activity of the synthesized compounds was undertaken by agar well diffusion method against gram positive bacteria (Bacillus licheniformis and Bacillus cereus) gram negative bacteria (Escherichia coli and Acetobactor sp.) and antifungal activity against (Aspergillus Flavus and Pichnanomala). Further the compounds which shows good activity (3b, 3c, 3d, 3f, 3g and 3j) are screened for in-vitro antitubercular activity by Micro-plate alamar blue assay (MABA) method against mycobacterium tuberculosis H37Rv strain provided important information about activity against these strains. The structure activities of the synthesized compounds were also discussed. Compounds 3a, 3c, 3d, 3f and 3g show good argument with the different substituent attached to the phenyl ring.